/Engine/Plugins/Online/OnlineSubsystemUtils/Source/OnlineSubsystemUtils/Public/VoiceInterfaceImpl.h
Is a given id presently muted (either by system mute or game server)
true if the net id is muted at all, false otherwise
virtual bool IsLocallyMuted ( const [FUniqueNetId](API\Runtime\CoreOnline\Online\FUniqueNetId) & UniqueId ) const